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Business Segment Information - Summary of Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 02, 2016 USD ($) | Jul. 04, 2015 USD ($) | Jul. 02, 2016 USD ($) Segment | Jul. 04, 2015 USD ($) | Jan. 02, 2016 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Revenues: |  |  |  |  |
Revenues | $ 111,828 | $ 98,327 | $ 208,366 | $ 190,578 |
Income from Continuing Operations Before Provision for Income Taxes: |  |  |  |  |
Total operating income | 12,244 | 12,643 | 22,337 | 23,014 |
Interest expense, net | (274) | (188) | (488) | (366) |
Income from Continuing Operations Before Provision for Income Taxes | 11,970 | 12,455 | 21,849 | 22,648 |
Capital Expenditures: |  |  |  |  |
Capital expenditures | 1,212 | 1,435 | 1,736 | 2,651 |
Total Assets: |  |  |  |  |
Total Assets | 480,782 |  | 480,782 |  | $ 415,498
Continuing Operations [Member] |  |  |  |  |
Total Assets: |  |  |  |  |
Total Assets | 480,767 |  | 480,767 |  | 415,483
Discontinued Operations [Member] |  |  |  |  |
Total Assets: |  |  |  |  |
Total Assets | 15 |  | 15 |  | 15
Fiber-Based Products [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 2,729 | 2,683 | 6,533 | 6,507 |
Operating Segment [Member] | Papermaking Systems [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 100,331 | 86,625 | 184,358 | 167,280 |
Income from Continuing Operations Before Provision for Income Taxes: |  |  |  |  |
Total operating income | 14,335 | 15,030 | 27,832 | 27,313 |
Capital Expenditures: |  |  |  |  |
Capital expenditures | 1,140 | 1,202 | 1,658 | 2,154 |
Operating Segment [Member] | Papermaking Systems [Member] | Continuing Operations [Member] |  |  |  |  |
Total Assets: |  |  |  |  |
Total Assets | 417,171 |  | 417,171 |  | 354,417
Operating Segment [Member] | Wood Processing Systems [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 8,768 | 9,019 | 17,475 | 16,791 |
Income from Continuing Operations Before Provision for Income Taxes: |  |  |  |  |
Total operating income | 2,451 | 2,543 | 3,257 | 4,788 |
Operating Segment [Member] | Wood Processing Systems [Member] | Continuing Operations [Member] |  |  |  |  |
Total Assets: |  |  |  |  |
Total Assets | 52,393 |  | 52,393 |  | 53,347
Corporate and Fiber-based Products |  |  |  |  |
Income from Continuing Operations Before Provision for Income Taxes: |  |  |  |  |
Total operating income | (4,542) | (4,930) | (8,752) | (9,087) |
Corporate and Fiber-based Products | Continuing Operations [Member] |  |  |  |  |
Total Assets: |  |  |  |  |
Total Assets | 11,203 |  | 11,203 |  | $ 7,719
Other [Member] |  |  |  |  |
Capital Expenditures: |  |  |  |  |
Capital expenditures | $ 72 | $ 233 | $ 78 | $ 497 |

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